2.1 should be released very soon so u could help out with some 2.2 Jira's. How about https://jira.jboss.org/browse/HORNETQ-85 , it should be pretty straight forward. basically if a message is rolled back or cancelled it goes back into the queue. We have a redelivery delay that can be set but it would be nice if this could back off exponentially rather than just try fter 1 sec for n attempts. This should be configurable of course.
also come join us on the 'hornetq freenode channel and we can chat about it more.
also take a look at http://community.jboss.org/wiki/Becomingacommitter
sorry for having been so silent in these two months, but I've been very very busy with my daily job.
It would be nice to chat with you about the jira you assigned to me on irc (my nick on the 'hornetq freenode channel' is danielebufarini).
I look forward to hear from you.